COMP247 Data Communications

Running head: COMP247 DATA COMMUNICATIONS
COMP247 Data Communications
Name of the Student
Name of the University
Author’s Note

1
COMP247 DATA COMMUNICATIONS
Answer to Question 1:
a. The equivalent subnet mask for the following slash notation in dotted decimal
notation is as follows:
i. /21 –
= 255.255.248.0
ii. /13 –
= 255.248.0.0
iii. /29 –
= 255.255.255.248
b. The maximum number of hosts that can be addressed on the following networks are
given below:
i. /19 – 255.255.224.0
= 8192 – 2
=8190 hosts
ii. /30 – 255.255.255.252
= 4 – 2
= 2 hosts
iii. /23 – 255.255.254.0
= 512 – 2
= 510 hosts
c. Checking legal subnet address and its corresponding slash notation form are given
below:
i. 255.255.224.0 –
Binary form - 11111111.11111111.11100000.00000000
Notation - /19

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COMP247 DATA COMMUNICATIONS
ii. 255.128.0.0 –
Binary form – 11111111.10000000.00000000.00000000
Notation - /9
iii. 255.252.255.0 –
Binary form – 11111111.11111100. 11111111.00000000
Notation - invalid
iv. 255.255.255.254 –
Binary form - 11111111.11111111.11111111.11111110
Notation - /31
Answer to Question 2:
Internet Relay Chat (IRC) –
[A]. IRC is being used for the facilitation of communication through text format using its
application layers’ protocols. A network model for the client’s server has been used to work
on chat process of its clients of whom mostly are various programs of computer that are
installed by its users through various web based applications or system so that they could be
run through third parties’ servers or locally. A communication has to be initiated through chat
server so that messages could be transmitted to clients. The basic design also facilitates group
also known channels. Private messages could also be sent in one-one format with features of
files as well as data transfer.
[B]. Each operating system which has support system for internet accessing does supports
client software. Being open protocol, it allows users for sharing of files with IRC clients
along with exchanging messages.